容迟网络作为一种全新的网络通信模式，能够为许多重要应用（如社会网络、车载网络、海洋监测等）提供有效的解决方案。容迟网络中的节点通常是资源受限的移动无线设备，因此在网络协议研究过程中必须考虑节点的资源限制，包括节点的带宽、缓存和能量等。本项目针对资源受限的容迟网络，首先提出一种能量有效的邻居发现协议，为网络节点通信提供前提保障；其次提出一种基于期望会面节点个数的路由协议，有效提高网络数据包分发性能；在节点资源受限条件下，提出一种基于合作的路由协议及相应的缓存管理协议，利用有限的缓存、能量和带宽最大化网络中的数据包传输率；进一步考虑节点的非合作特性，针对每个节点没有动机转发其它节点的数据包，提出一种促使节点相互合作的激励机制，并解决激励机制中的安全问题。本项目所提出的针对资源受限容迟网络的多层协议设计方案，将为容迟网络的理论研究提供新途径，为基于容迟网络的应用提供理论基础和方法支撑。

As an emergent communication paradigm, Delay Tolerant Networks (DNTs) can provide efficient solutions for many significant applications, such as social networks, vehicular networks, underwater sensor networks and ocean monitoring, etc. Since the nodes in DTNs are always some resource-limited mobile wireless devices, it is necessary to consider the resource constraints of the nodes during the research on the network protocols. This project firstly proposes an energy-efficient neighbor discovery protocol, which guarantees the communication between the nodes in DTNs. Secondly, this project proposes a routing protocol based on the nodes' expected encounter values to improve the performance of delivery ratio. Thirdly, this project proposes a novel cooperative routing protocol and an efficient buffer management protocol, which can maximize the delivery ratio under the constraints of buffer size, energy and bandwidth. By further considering the nodes' noncooperative characteristic, with which each node has no incentive to forward other nodes' messages, this project proposes a secure incentive mechanism to motivate the nodes to cooperate with each other on the message forwarding. The proposed multi-layer protocols for the resource-constraint DTNs in this project will develop a new direction for the theoretical research of the DNTs, and provide theoretical foundation and technical support for the DTNs-based applications.